JP2012011058A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner configured to reduce sound transmitted to an air intake duct from an electric fan, and reduce noise.SOLUTION: The air intake duct 27 has a front surface having an opening 27a communicating with a dust collecting device 2, and a bottom surface having an exhaust hole 27b communicating with the electric fan. The air intake duct is internally provided with an inner duct 60, and the inner wall surface of the air intake duct opposite to the exhaust hole 27b has a double wall structure.

Description

  The present invention relates to a vacuum cleaner having an intake duct between a dust collector and an electric blower.

  As a conventional technique, the vacuum cleaner described in Patent Document 1 includes a chamber having a silencer coupled to an electric blower unit and having an inlet facing the intake opening, and a sound absorbing member built in the chamber. Describes a vacuum cleaner that is designed to reduce noise by devising the length, cavity, or shape of the.

  Moreover, in the vacuum cleaner of patent document 2, the electric blower cover which covers an electric blower in a main body case is provided, and the silencer cover which divides the suction side space which communicates with the intake side of an electric blower on the outer side of this electric blower cover The vacuum cleaner which aims at noise reduction is described.

JP 2009-125214 A JP 2010-82167 A

  In the vacuum cleaner described in Patent Document 1, the silencers connected to the intake side and the exhaust side of the electric blower unit are arranged in series, and when incorporated in the vacuum cleaner body, the total length of the vacuum cleaner body There was a problem of becoming longer. In addition to the chamber and the sound absorbing member, there is a cavity that exerts a silencing effect, so that the entire volume is increased and the size (volume) of the main body of the vacuum cleaner is increased.

  In the electric vacuum cleaner described in Patent Document 2, the outside of the electric blower cover includes a silencer cover that partitions the intake side space communicating with the intake side of the electric blower, but the flow path communicating with the intake side is provided. It was curved many times, and there was a problem of reducing the suction force, which is the basic performance of a vacuum cleaner.

  The present invention provides a vacuum cleaner that reduces noise without reducing the suction force of the cleaner, without increasing the length of the cleaner body, without increasing the size of the cleaner body. The purpose is that.

  The present invention is characterized in that the inner wall surface of the air intake duct facing the electric blower side opening of the air intake duct is composed of multiple wall surfaces.

Further, the present invention includes a silencer cylinder having a cylindrical opening having a plurality of holes on the circumferential surface inside the intake duct, and a wall surface formed on the front surface of the silencer cylinder is opposed to the dust collector. It is characterized by that.

  According to the present invention, since the inner wall surface of the intake duct facing the electric blower side opening of the intake duct is configured with multiple wall surfaces, the sound transmitted from the electric blower to the intake duct can be reduced, and noise can be reduced.

  Further, according to the present invention, a noise reduction cylinder having a cylindrical opening portion having a plurality of holes on the circumferential surface is provided inside the intake duct, and the wall surface formed on the front surface of the noise reduction cylinder is attached to the dust collector. By facing each other, not only the sound transmitted from the electric blower to the intake duct can be reduced, but also high frequency sound (about 4 kHz to 10 kHz) can be reduced, and noise can be reduced.

It is a cross-sectional view of the cleaner body of the embodiment of the present invention. (A) is a perspective view of the dust collector of the Example of this invention, (B) is a cross-sectional view of the dust collector of the Example of this invention. (A) is a perspective view of the inner cylinder and outer cylinder of the Example of this invention, (B) is a perspective view of the back side of the inner cylinder of the Example of this invention. (A) is a perspective view of the state which opened the front cover of the dust accommodating part of the Example of this invention, (B) is the perspective view of the state which opened the rear filter of the dust accommodating part of the Example of this invention. FIG. (A) is the front view seen from the dust accommodating part outer side of the front cover of the dust accommodating part of the Example of this invention, (B) is dust accommodating of the front cover of the dust accommodating part of the Example of this invention. It is the front view seen from the part inside. It is the front view seen from the dust separation part side when the front cover of the dust accommodating part of the Example of this invention is removed. It is an external view of the vacuum cleaner of the Example of this invention. It is a top view of the exhaust duct of the Example of this invention, a filter, and a cord reel chamber. It is a cross-sectional view of the cleaner body of the embodiment of the present invention. It is a plane sectional view of the cleaner body of the example of the present invention. It is an external view of the intake duct unit of the Example of this invention. It is the expanded view which decomposed | disassembled the intake duct of the Example of this invention. It is a front view of the intake duct unit of the Example of this invention. It is AA sectional drawing of the air intake duct unit of the Example of this invention. It is BB sectional drawing of the air intake duct unit of the Example of this invention. It is a frequency characteristic graph which shows the noise reduction effect by the intake duct part of the Example of this invention. It is the expanded view which decomposed | disassembled the intake duct of the other Example of this invention. It is an external view of the intake duct of the other Example of this invention. It is a front view of the intake duct unit of the other Example of this invention. It is CC sectional drawing of the intake duct unit of the other Example of this invention. It is DD sectional drawing of the intake duct unit of the other Example of this invention. It is a frequency characteristic graph which shows the noise reduction effect by the intake duct part of the other Example of this invention.

  Examples 1 and 2 of the present invention will be described below.

  1 and 9 show cross-sectional views of the cleaner body of the embodiment of the present invention. It is preferable that the vacuum cleaner main body 1 is horizontally placed in the usage state of the vacuum cleaner, and the vacuum cleaner main body 1 is vertically placed in the housed state of the vacuum cleaner. In the usage state of the vacuum cleaner, if the main body inlet 21 side is the front (upstream side) and the main body exhaust port 30 side is the rear (downstream side), the main body inlet 21 and the main body exhaust port are used in the state of use of the electric vacuum cleaner. 30 are substantially horizontal with respect to the floor (vacuum cleaner body 1 is placed horizontally), and in the housed state of the vacuum cleaner, the main body intake port 21 is on the upper side in the direction of gravity and the main body exhaust port 30 is on the lower side in the direction of gravity operation (vacuum cleaner). The main body 1 is placed vertically). FIG. 1 and FIG. 9 are cross-sectional views of the vacuum cleaner main body 1 when the vacuum cleaner is in use.

  FIG. 10 is a plan sectional view of the cleaner body of the embodiment of the present invention when the cleaner body 1 is cut with the dust collector 2 removed. Further, in this embodiment, when the cleaner body 1 is placed horizontally as shown in FIG. 9, the direction having the main body inlet 21 is the front direction of the cleaner body 1, and the direction having the main body exhaust port 30 is the cleaner body. 1 is referred to as the longitudinal direction of the cleaner body 1 from the front direction to the rear direction of the cleaner body 1. Further, in this embodiment, when the cleaner body 1 is placed horizontally as shown in FIG. 9, the direction with the handle 16 is upward of the cleaner body 1, and the direction with the wheels 55 is downward of the cleaner body 1. And the height direction of the cleaner body 1 from the upper direction to the lower direction of the cleaner body 1. Further, in this embodiment, when the cleaner body 1 is placed horizontally as shown in FIG. 10, the width of the cleaner body 1 extends from one wheel 55 to the other wheel 55 of the wheels 55 on both sides of the cleaner body 1. Called the direction.

  First, the structure of the cleaner body 1 will be described. The dust collector 2 that collects dust from the sucked air is detachably disposed on the front side of the cleaner body 1. When the longitudinal direction (axial direction) of the dust collector 2 is a gravity action direction, the height of the cleaner body 1 is increased. On the other hand, the closer the axial direction of the swirling flow in the dust collector 2 (the axial direction of the dust collecting device 2) is to the gravity acting direction, the greater the separation effect due to the centrifugal separation action, and the axial direction of the swirling flow in the dust collecting device 2 When the angle exceeds 45 ° with respect to the direction of gravity action, the separation effect due to the centrifugal separation action is extremely reduced. Therefore, in order to reduce the height of the vacuum cleaner main body 1 and suppress the decrease in the separation effect due to the centrifugal separation action, in this embodiment, the axial direction of the dust collector 2 is 40 ° to the gravity action direction. It is about 45 °. However, in order to increase the separation effect by the centrifugal separation action, the axial direction of the dust collector 2 may be smaller than 40 ° (for example, 0 °) with respect to the gravity action direction. Instead of disposing the dust separation unit (swivel unit) 4 on the lower side and the dust storage unit 5 on the upper side, the dust separation unit 4 may be disposed on the upper side and the dust storage unit 5 on the lower side. . In this case, the inlet pipe 3 is preferably connected to the circumferential surface of the front end portion in the axial direction of the dust separator 4.

  The dust collector 2 swirls the sucked air and communicates with the dust separator 4 that separates the dust by a centrifugal separation action (cyclone method), and the dust separator 4 accommodates the dust separated by the dust separator 4. A dust container 5 is provided. The dust separator 4 and the dust container 5 are arranged in the axial direction of the dust collector 2 and are connected and communicated with each other in the axial direction. That is, the dust separator 4 is disposed on the front side of the cleaner body 1, and the dust container 5 is disposed on the rear side of the cleaner body 1 with respect to the dust separator 4. The dust separator 4 and the dust container 5 are connected so that the user can easily separate the dust separator 4 and the dust container 5. A tubular main body inlet 21 is provided at the front end of the cleaner body 1. A part of the front end face in the axial direction of the dust separator 4 is open, and the opening is connected to the inlet pipe 3. Instead of the front end surface in the axial direction of the dust separator 4, the circumferential surface of the front end in the axial direction of the dust separator 4 may be connected to the inlet pipe 3.

  The dust separation unit 4 includes a hollow substantially cylindrical outer cylinder 6 and a hollow substantially cylindrical inner cylinder 7 enclosed in the outer cylinder 6 with a concentric axis with the outer cylinder 6. When the axial direction of the dust separation part 4 is inclined with respect to the gravity action direction in order to prevent the separation effect due to the centrifugal separation action from deteriorating due to the axial center of the swirling flow being shifted in the gravity action direction by gravity. The axis of the inner cylinder 7 may be shifted downward with respect to the axis of the outer cylinder 6. As shown in FIG. 3 (A), one axial end surface (front end surface) of the outer cylinder 6 is closed except for an opening connected to the inlet pipe 3, and the other axial end surface (rear side) of the outer cylinder 6 is closed. The end face is open. The outer cylinder 6 is preferably made of transparent or translucent plastic or resin so that dust accumulation can be seen by the user or a sensor provided outside the outer cylinder 6 can detect the accumulation of dust. One end face (front end face) in the axial direction of the inner cylinder 7 is closed, and the other end face (rear end face) in the axial direction of the inner cylinder 7 is open. As shown in FIG. 3A, a recessed portion 8 that is recessed inward in the axial direction of the inner cylinder 7 is formed at the center of the closed portion of one end surface in the axial direction of the inner cylinder 7. The inlet pipe 3 is opposed to the closed portion of one end surface in the axial direction of the inner cylinder 7, that is, the recessed portion 8. As shown in FIG. 3A, a part of the recessed portion 8 reaches the outer peripheral end of the inner cylinder 7. In order to reduce the pressure loss of air, it is preferable that the opening direction of the recessed part 8 is a downward direction. However, the opening direction of the recessed part 8 may be upward or lateral. As shown in FIG. 3A, at the outer peripheral end of the inner cylinder 7 of the recess 8, the recess 8 does not face straight in the radial direction of the inner cylinder 7 but is slightly inclined in the circumferential direction. As shown in FIG. 1, the depth of the recess 8 in the axial direction is about half of the axial length of the cylindrical portion of the inner cylinder 7. However, the axial depth of the recessed portion 8 may extend over substantially the entire axial length of the cylindrical portion of the inner cylinder 7. In this case, the opening of the recessed portion 8 is formed in a part of the circumferential surface of the inner cylinder 7 over almost the entire length of the cylindrical portion of the inner cylinder 7. Further, a guide tube 38 is connected to the outer peripheral end of the recess 8. The cross section of the guide tube 38 has a substantially quarter circle shape, is formed along the outer peripheral surface of the inner cylinder 7, and the outer peripheral surface of the inner cylinder 7 also forms part of the inner wall surface of the flow path. The guide tube 38 is formed on the outer peripheral surface of the inner cylinder 7 in the circumferential direction by about several centimeters. Therefore, the air that has flowed in the axial direction by the inlet pipe 3 is changed in the radial direction by the recessed portion 8 and further changed in the circumferential direction by the outer peripheral end portion of the inner cylinder 7 of the recessed portion 8. At 38, it can be changed in the circumferential direction. Moreover, it is preferable that the recessed part 8 does not have an unevenness | corrugation and is formed in a curved surface. Thereby, air can be sufficiently swirled while suppressing pressure loss. The guide tube 38 may not be provided. An outer extension 34 extending toward the outer cylinder 6 is formed on the outer periphery of the other axial end surface (rear end face) of the inner cylinder 7. That is, as shown in FIG. 3A, the other axial end surface (rear side end surface) of the inner cylinder 7 has an annular shape with the inner side of the inner cylinder 7 opened.

  As shown in FIG. 3A, a part of the outer extending portion 34 in the circumferential direction is open. With this opening, air outside the inner cylinder 7 can flow into the dust container 5. The inner cylinder 7 is made of an antibacterial metal (for example, silver, copper) or an antibacterial substance (for example, silver, copper) or a coated metal (for example, stainless steel) so as to suppress the growth of bacteria. Preferably it is configured. However, the inner cylinder 7 may be comprised with resin also including a cylindrical part. Then, as shown in FIG. 3A, the outer cylinder 34 is inserted in the axial direction from the other axial end surface of the outer cylinder 6, so that the outer peripheral end of the outer extension 34 comes into contact with the inner periphery of the outer cylinder 6. As a result, the other axial end surface of the outer cylinder 6 is closed. The outer cylinder 6 and the inner cylinder 7 are connected so that the user can easily separate the outer cylinder 6 and the inner cylinder 7. A plurality of through holes 33 are provided on the circumferential surface of the inner cylinder 7. The inner cylinder 7 has a filter function by the plurality of through holes 33. The through-hole 33 allows air to flow from the outer side of the inner cylinder 7 to the inner side of the inner cylinder 7 without large dust flowing into the inner cylinder 7. Although it depends on the suction force, garbage having a weight of 1 yen or more cannot be sucked up in the outer cylinder 6 and may remain in the outer cylinder 6. By connecting the outer cylinder 6 and the inner cylinder 7 so that the user can easily separate the outer cylinder 6 and the inner cylinder 7, the user can easily separate the outer cylinder 6 and the inner cylinder 7 from each other. The dust accumulated in the outer cylinder 6 can be easily discharged, and the hair and lint caught in the through hole 33 of the inner cylinder 7 can be easily removed.

  In order to keep the airtightness of the connecting portion between the dust separator 4 and the dust container 5, a packing 9 is provided on the other axial end surface of the inner cylinder 7. The packing 9 is not only provided on the outer extension 34, but also projects in the axial direction of the inner cylinder 7. Therefore, the inside of the inner cylinder 7 is not completely hollow, and a partially closed space exists due to the packing 9. Further, a recessed portion 39 that is recessed inward in the axial direction of the inner cylinder 7 is formed in a portion of the packing 9 that protrudes to the inner side of the inner cylinder 7. The recess 39 has a handle function. Thereby, the user can hold the dust separation part 4 or the inner cylinder 7 by inserting a finger into the recess 39. A part of the upper side of the extended portion 34 is open and communicates with the outer flow path 35 of the front lid 11. That is, the inside of the outer cylinder 6 and the outside of the cylindrical portion of the inner cylinder 7 communicates with the outer flow path 35 of the front lid 11. As shown in FIG. 3 (A), the circumferential wall surface of the opening on the upper side of the extended portion 34 has a high wall surface on the side facing the opening of the guide tube 38 in the circumferential direction. The wall surface on the opening side of the guide tube 38 is preferably low. For example, assuming that the opening direction of the guide tube 38 is the counterclockwise direction when the dust separation unit 4 is viewed from the front, the left wall surface is high among the circumferential wall surfaces of a part of the upper opening of the extension portion 34, The wall on the right side is low. That is, since a part of the upper side of the extended portion 34 is opened, the circumferential direction of the extended portion 34 is less than one round of the outer periphery of the inner cylinder 7 but is shifted in a spiral shape. Therefore, the swirling flow outside the inner cylinder 7 can collide with the wall surface in the circumferential direction of a part of the opening on the upper side of the extended portion 34 and can smoothly change the direction in the axial direction. Also easily flows to the dust container 5. On the other hand, the inner side of the inner cylinder 7 communicates with the inner flow path 36 of the front lid 11.

  The dust container 5 is provided with a hollow case 10 having an axially one end face (front end face) and an axially other end face (rear end face) that are substantially inverted triangular in cross section. One end surface in the axial direction of the case 10 is closed by a front lid 11 that can be opened and closed. A shaft 31 is provided at the lower end of the front lid 11, and the shaft 31 is supported by the lower end of the case 10. The front lid 11 can be rotated back and forth in the axial direction of the case 10 with the shaft 31 as a fulcrum. A claw projects from the upper end portion of the front lid 11 on the case 10 side. On the other hand, a button 17 (which may be a lever) that can be pressed by the user is provided on the upper front side of the case 10, and a transmission rod (rod) 18 extending to the front side of the case 10 is connected to the button 17. One end of the transmission rod 18 is connected to the button 17, and the other end of the transmission rod 18 is formed in a claw shape. The claw at the other end of the transmission rod 18 can be engaged with the claw at the upper end of the front lid 11. When the front lid 11 is closed to the case 10, it is possible to prevent the front lid 11 from being opened by engaging the claw at the other end of the transmission rod 18 and the claw at the upper end of the front lid 11. When the user presses the button 17, the transmission rod 18 slides forward (may rotate upward), and the engagement between the other end of the transmission rod 18 and the upper end of the front lid 11 is engaged. The combination is released and the front lid 11 can be opened from the case 10 by gravity. While the handle 16 is formed in a horizontal direction, the normal direction of one end surface in the axial direction of the case 10 (corresponding to the front lid 11 portion) is inclined by 45 ° to 50 ° with respect to the horizontal direction. That is, when the user holds the handle 16 and lifts the dust container 5, one end surface in the axial direction of the case 10 (corresponding to the front lid 11 portion) faces downward (the direction of gravity action). Therefore, the front lid 11 can be opened from the case 10 by gravity. As will be described later, if the dust collection basket (dust collection container) 12 is urged by a spring (elastic body) to jump out to the front side of the case 10, the dust collection basket 12 pushes the rear surface of the front lid 11. Therefore, when the user presses the button 17, the front lid 11 can be smoothly opened from the case 10 by the pressing force of the dust collecting basket 12.

  The other axial end surface of the case 10 is closed by a filter 15 that can be opened and closed. A shaft 32 is provided at the lower end of the filter 15, and the shaft 32 is supported by the lower end of the case 10. The filter 15 can be rotated back and forth in the axial direction of the case 10 with the shaft 32 as a fulcrum. The filter 15 is formed with a filter member folded in a pleat shape within a frame body having a substantially square cross-sectional shape. As shown in FIG. 4B, the wave direction of the filter member is preferably the height direction (gravity acting direction). The filter 15 is, for example, a high-density HEPA filter (High Efficiency Particulate Air Filter). A HEPA filter is an air filter having a particle collection rate of 99.97% or more with respect to particles having a rated air volume of 0.3 μm and an initial pressure loss of 245 Pa or less. A packing 25 may be provided on the surface of the filter 15 opposite to the case 10. The packing 25 can maintain airtightness between the other axial end surface of the dust container 5 and the cleaner body 1 (particularly, the inlet of the intake duct 27). The shaft 31 and the shaft 32 may be shared. Further, the shaft 32 may be provided not at the lower end portion of the filter 15 but at the upper end portion of the filter 15.

  A dust collecting basket 12 is enclosed in the case 10. The shape of the dust collecting basket 12 may be a cage shape, a box shape or a container shape with one surface opened, or a dustpan shape. That is, the dust collecting basket 12 has a shape recessed on the opposite side to the opening. The cross-sectional shape of the dust collecting basket 12 may be a substantially square shape, a substantially circular shape, or a substantially triangular shape. The cross-sectional shape of the dust collecting basket 12 is preferably smaller from the opening surface toward the bottom surface. As a result, the cross-sectional area increases toward the side (opening side) where the dust is discharged, so that the user can easily discharge the dust accumulated in the dust collecting basket 12. The shape of the dust collecting basket 12 is formed by a frame body (support frame). It is preferable that a mesh member made of metal, nylon, or the like is coated or adhered to the bottom surface other than the opening surface of the dust collecting basket 12 and the top, bottom, left, and right surfaces. By providing not only the bottom surface of the dust collecting basket 12 but also the top, bottom, left, and right surfaces, air flow can be secured even if dust accumulates on the bottom surface of the dust collecting basket 12, and the pressure loss of the suction air Can be reduced, and a decrease in suction force can be suppressed. This mesh member is air permeable and has a filter function of collecting dust. A disposable tissue paper may be used instead of the mesh member, or a mesh member and a tissue paper may be combined as long as they are breathable and have a filter function for collecting dust. For example, the user may wear tissue paper on the mesh member. The opening surface of the dust collecting basket 12 coincides with the opening surface of one end surface (front end surface) in the axial direction of the case 10. That is, the opening direction of the dust collecting basket 12 and the opening direction of the one end surface in the axial direction of the case 10 are the same. As shown in FIG. 6, the upper half of the outer peripheral end of the opening surface of the dust collecting basket 12 abuts on the inner peripheral surface of one end surface in the axial direction of the case 10, and the outer peripheral end of the opening surface of the dust collecting basket 12. The lower half is not in contact with the inner peripheral surface of one end surface of the case 10 in the axial direction. The dust collecting basket 12 has a shaft 14 at the bottom. The shaft 14 is supported in the case 10. Therefore, the dust collecting basket 12 can be rotated back and forth in the axial direction of the case 10 with the lower shaft 14 as a fulcrum. Thereby, when the front lid 11 is opened from the dust container 5, a part of the dust collecting basket 12 can be ejected from the dust container 5 by gravity. Since the formation position of the shaft 14 with respect to the case 10 is on the same side (lower side) as the formation position of the shaft 31 with respect to the case 10, the front cover 11 is obstructed when the front cover 11 is opened from the dust container 5. A part of the dust collecting basket 12 can be ejected from the dust container 5 without any trouble. Further, the shaft 14 may be provided with a helical spring in which an elastic force acts in a direction in which the dust collecting basket 12 is pushed out to the front lid 11 side. As a result, when the front lid 11 is opened from the dust container 5, a part of the dust collection basket 12 can jump out of the dust container 5 vigorously by the elastic force of the spring. The dust accumulated in 12 can be easily discharged. Further, the dust collecting basket 12 is divided into two parts in the vertical direction, that is, it is preferably composed of two structures, that is, an upper half frame (support) and a lower half frame (support). The two divided dust collecting baskets 12 are connected by a shaft 13 formed outside the bottom surface of the dust collecting basket 12. Therefore, as shown in FIG. 4 (A), the dust collecting basket 12 has the opening surface of the dust collecting basket 12 split vertically, with the middle of the bottom as a fulcrum. In particular, when a part of the dust collection basket 12 jumps out of the dust container 5, the dust collection basket 12 breaks up and down. As a result, the user can more easily discharge the dust accumulated in the dust collecting basket 12. In particular, dust stuck to the inner surface of the dust collecting basket 12 can be easily removed. However, the upper and lower divided configuration of the dust collecting basket 12 is not essential. In addition, as described above, the front side of the case 10 is inclined by 40 ° to 45 ° with respect to the direction of gravity action, and the dust collection basket 12 jumps out of the dust storage portion 5 by 30 °, so that the dust collection basket 12 Dust accumulated inside can be discharged in the direction of gravity.

  An outer channel 35 and an inner channel 36 penetrating in the axial direction are formed in the front lid 11. The outer flow path 35 is formed on the upper side of the front lid 11, and one end of the outer flow path 35 communicates with the opening of the extended part 34, particularly between the outer cylinder 6 and the inner cylinder 7 of the dust separation part 4. The other end of the outer flow path 35 communicates with the opening of the dust collecting basket 12 in the case 10. In order to prevent the dust accumulated in the dust collecting basket 12 from flowing back to the outer flow path 35 and the dust separation part 4 when the vacuum cleaner is stopped, the other end of the outer flow path 35 is the opening of the dust collecting basket 12. Of these, it is preferable to communicate with the upper half or near the upper end. However, the other end of the outer flow path 35 may communicate with the central portion of the opening of the dust collecting basket 12. Furthermore, in order to prevent the dust accumulated in the dust collecting basket 12 from flowing back to the outer flow path 35 and the dust separator 4 when the vacuum cleaner is stopped, A check valve (not shown) that covers the flow path 35 is preferably formed. The check valve rotates to the dust collecting basket 12 with the upper end as a fulcrum. However, the check valve is not an essential configuration. The cross-sectional area of the outer flow path 35 increases from one end of the outer flow path 35 toward the other end. The formation direction of the outer flow path 35 is a direction from the outer side of the front lid 11 toward the center side from one end of the outer flow path 35 to the other end. That is, the direction is from the outside of the dust collecting basket 12 toward the center side. In order to suppress the turbulence of the air flowing into the dust collecting basket 12 from the outer flow path 35, the outer flow path 35 is formed in the direction of the wall surface (upper wall surface) on the side where the outer flow path 35 of the dust collecting basket 12 communicates. Is preferred. The inner flow path 36 is formed from the center of the front lid 11 to the lower side, and one end of the inner flow path 36 communicates with the other end opening in the axial direction of the inner cylinder 7 (inside the inner cylinder 7) of the dust separator 4; The other end of the inner flow path 36 communicates with the case 10, particularly with the outside of the dust collecting basket 12. The other end of the inner flow path 36 is preferably in communication with the lower outside of the dust collecting basket 12. The inner flow path 36 is formed avoiding the outer flow path 35. Contrary to the outer flow path 35, the cross-sectional area of the inner flow path 36 is reduced from one end of the inner flow path 36 toward the other end.

  A handle 16 that extends in the horizontal direction and can be gripped by the user is provided on the outer side of the upper portion of the dust container 5. The user can hold the handle 16, lift the dust container 5 upward, and remove only the dust container 5 from the cleaner body 1 while leaving the dust separator 4 in the cleaner body 1. In addition, if the dust separation part 4 and the dust storage part 5 are connected, if the user holds the handle 16 and lifts the dust storage part 5 upward, the dust separation part 4 and the dust storage part 5 will be described. And, that is, the dust collector 2 itself can be removed from the cleaner body 1. As shown in FIG. 1, the axial direction other end surface (corresponding to the filter 15 portion) of the dust container 5 is preferably inclined toward the case 10 than the vertical surface (gravity acting direction). That is, it is preferable that the lower part is closer to the case 10 side than the upper part of the other axial end surface of the dust container 5. Moreover, as shown in FIG. 1, the formation direction of the axial direction one end surface (equivalent to front cover 11 part) of the dust accommodating part 5 is about 40 to 45 degrees on the case 10 side from the vertical surface (gravity acting direction). Inclined. That is, the lower part is closer to the case 10 side than the upper part of the one axial end surface of the dust container 5. As a result, the one end surface in the axial direction and the other end surface in the axial direction of the dust container 5 have an inverted C shape with respect to the vertical surface (gravity acting direction). Thereby, when a user lifts the dust accommodating part 5 upward, it becomes less caught, and the user can easily remove the dust accommodating part 5 from the cleaner body 1. Then, the user can easily remove the dust separator 4 from the cleaner body 1 by holding the recess 39 and lifting the dust separator 4 upward or obliquely upward after removing the dust container 5. As shown in FIG. 1, it is preferable that the axial direction other end surface (corresponding to the inlet pipe 3 portion) of the dust separation portion 4 is inclined toward the outer cylinder 6 side than the vertical surface (gravity acting direction). That is, it is preferable that the lower part is closer to the outer cylinder 6 side than the upper part of the other axial end surface of the dust separator 4. As a result, when the user lifts the dust separator 4 upward or obliquely upward, there is less catching, and the user can easily remove the dust separator 4 from the cleaner body 1. Further, not only when the user removes the dust separator 4, but also when the dust separator 4 and the dust container 5 are integrated, that is, when the dust collector 2 itself is removed from the cleaner body 1. Since the one end surface in the axial direction and the other end surface in the axial direction have an inverted C shape with respect to the vertical surface (the direction of gravity action), the user is less likely to be caught when lifting the dust collector 2 upward. Can easily remove the dust collector 2 from the cleaner body 1.

  A hose joint pipe 20 is inserted into the main body inlet 21 and can hold the hose joint pipe 20. A packing 22 is provided at one end of the main body inlet 21. Thereby, the airtightness of the hose joint pipe 20 and the inlet pipe 3 can be maintained. A caster support portion 23 for supporting casters is provided at the front lower end of the vacuum cleaner body 1 (below the dust collector 2). An intake duct 27 extending in the front-rear direction of the cleaner body 1 is provided on the upper rear side in the cleaner body 1. An opening 27 a (a dust collector side opening) at one end in the extending direction of the intake duct 27 faces the filter 15. An auxiliary filter 26 is provided near the opening 27 a at one end of the intake duct 27. Thereby, it is possible to suppress the electric blower 28 from sucking the dust remaining outside the dust collector 2. The other end in the extending direction of the intake duct 27 is closed, and the lower portion in the vicinity of the other end in the extending direction of the intake duct 27, that is, the electric blower 28 side opens as a discharge port 27b (opening on the electric blower side) of the intake duct 27. ing. A dust removing device 24 that removes dust adhering to the filter 15 is provided at a position in contact with the filter 15 at an upper portion of the opening 27 a at one end of the intake duct 27 of the cleaner body 1. The dust removing device 24 includes a spiral spring (elastic body) on the outer periphery of the rotating body. The dust removing device 24 is rotated by a motor or by pulling out a cord 47 provided around the cord reel 41, and a spiral spring bounces the filter member of the filter 15, so that dust attached to the filter 15 is shaken off. As described above, since the wave direction of the filter 15 is in the height direction, the dust that has been shaken off easily falls in the direction of gravity. The dust shaken off from the filter 15 accumulates in the case 10. Accordingly, clogging of the filter 15 can be suppressed, a decrease in air pressure loss can be suppressed, and a decrease in suction force can be suppressed.

  As shown in FIG. 1 and FIG. 9, an electric blower 28 that generates a suction force is provided on the lower rear side in the cleaner body 1. The electric blower 28 is installed in a vertical position with the suction port 28a of the electric blower 28 facing upward. The electric blower 28 is longest from the surface of the suction port 28a to the surface opposite to the surface of the suction port 28a. Therefore, the length of the vacuum cleaner main body 1 from the hose joint pipe 20 to the main body exhaust port 30 can be shortened by installing the electric blower 28 vertically so that the suction port 28a of the electric blower 28 faces upward. . An intake duct 27 is provided in the upper part of the electric blower 28 in the cleaner main body 1, and the suction port 28 a of the electric blower 28 and the discharge port 27 b of the intake duct 27 are connected to each other. In the present embodiment, when the electric blower 28 is installed in the cleaner body 1, the electric blower 28 is installed so as to have the suction port 28 a at the upper part and the exhaust port 28 b on the side of the electric blower 28. In the cleaner body 1, an exhaust duct 40 communicating with the exhaust port 28 b of the electric blower 28 is provided downstream of the electric blower 28 and in front of the electric blower 28. Further, a filter 29 communicating with the exhaust duct 40 is provided in the cleaner body 1 on the downstream side of the exhaust duct 40 and on the front side of the exhaust duct 40. The exhaust duct 40 and the filter 29 are fixed by fixing means such as screws. This is because the exhaust duct 40 and the filter 29 are fixed so that the airtightness between the exhaust duct 40 and the filter 29 can be maintained, and all the exhaust gas emitted from the exhaust port 28b of the electric blower 28 can pass through the filter 29. It is to do. The filter 29 is formed with a filter member folded in a pleat shape in a frame body having a substantially square cross section. The wave direction of the filter member is preferably the height direction (gravity acting direction). The filter 29 is, for example, a high-density ULPA filter (Ultra Low Penetration Air Filter). The ULPA filter is an air filter having a particle collection rate of 99.9995% or more for particles having a rated air volume of 0.15 μm and an initial pressure loss of 245 Pa or less. The particle collection efficiency is higher than the particle collection efficiency. And the main body exhaust port 30 is provided in the rear-end surface of the cleaner body 1. FIG.

  As shown in FIG. 10, the cord 47 has a plug 43 at the tip. Electricity is obtained by inserting the plug 43 into an outlet in a room or the like. When using a vacuum cleaner other than the rechargeable vacuum cleaner, the electric blower 28 and the like cannot be operated unless the plug 43 is inserted into an outlet. Therefore, it is preferable to provide the cord reel 41 in a place where it does not get in the way when using the electric vacuum cleaner. Hereinafter, a place where the cord reel 41 is provided is referred to as a cord reel chamber 42. When the cord reel chamber 42 is provided in the front portion of the cleaner body 1 so that the plug 43 and the cord 47 come out from the front portion of the cleaner body 1, the plug 43 and the cord 47 come out in the traveling direction, so that cleaning is performed. Difficult to handle. Even when the cord reel chamber 42 is provided on the side surface or upper surface of the cleaner body 1 so that the plug 43 or the cord 47 comes out from the side surface or upper surface of the cleaner body 1, it is difficult to handle when cleaning. By providing the cord reel chamber 42 at the rear part of the cleaner main body 1 so that the plug 43 and the cord 47 come out from the rear end surface of the cleaner main body 1, it becomes easy to handle without disturbing the moving direction or the direction change. In the present embodiment, the electric blower 28 and the cord reel chamber 42 are provided adjacent to each other in the cleaner body 1. In addition, the electric blower 28 and the cord reel chamber 42 are provided behind the dust collector 2 in the cleaner main body 1.

  As shown in FIGS. 1 and 9, the exhaust duct 40 is provided between the electric blower 28 and the filter 29. The exhaust duct 40 is a hollow member, and includes an outer peripheral portion 44 (a portion with a diagonally lowering diagonal line in FIG. 8) covering the lower portion from the side portion of the electric blower 28, and from the periphery of the exhaust port 28 b of the electric blower 28 to the filter 29. It is comprised from the cylindrical-shaped channel | path part 48 which connects between. The shape of the outer peripheral portion 44 is a substantially prismatic shape, the diameter thereof is about half the width of the rear portion of the cleaner body 1, and the length in the height direction is shorter than the length in the height direction of the electric blower 28. The upper surface of 44 has an opening 44a, and the side surface of the outer peripheral portion 44 has an opening 44b. A packing 19 made of rubber or the like is provided between the upper surface of the outer peripheral portion 44 and the electric blower 28, so that airtightness is secured between the exhaust duct 40 and the electric blower 28 and at the same time the vibration when using the electric blower 28 is suppressed. Have. The opening 44 b on the side surface of the outer peripheral portion 44 faces the exhaust port 28 b of the electric blower 28. The size of the opening 44 a on the upper surface of the outer peripheral portion 44 is larger than the diameter of the electric blower 28, and the outer peripheral portion side opening 44 b is smaller than the diameter of the electric blower 28.

  Moreover, as shown in FIG. 8, the channel | path part 48 is comprised from two cylindrical parts. One is a portion where the other side is inclined with respect to one side (hereinafter referred to as a passage portion A45, a portion where a horizontal line is drawn in FIG. 8), and the other is substantially parallel to one side and the other side. (Hereinafter, passage portion B46, a portion where a diagonal line rising to the right in FIG. 8 is drawn). Both the passage portion A45 and the passage portion B46 have an inlet which is an opening. The inlet of the passage portion A45 (hereinafter referred to as the inlet A45a) is connected to the outer peripheral portion side opening, and the outlet of the passage portion A45 (hereinafter referred to as the outlet A45b) is connected to the inlet of the passage portion B46 (hereinafter referred to as the inlet B46a). The outlet of the passage portion B46 (hereinafter, outlet B46b) is connected to the filter 29. The inlet A45a is smaller than the outlet A45b, and the inlet B46a and the outlet B46b are approximately the same size. The inlet A45a and the outer peripheral side surface opening 44b have the same size, and the outlet A45b and the inlet B46a have the same size. Further, the length from the inlet A45a to the outlet A45b is longer than the length from the inlet B46a to the outlet 46b. This is to prevent the overall length of the cleaner body 1 from becoming long. Further, in the passage portion 48 of the exhaust duct 40, the outlet B46b connected to the filter 29 is wider than the inlet A45a connected to the outer peripheral portion 44. Further, the height from the inlet A45a to the outlet B46b of the passage portion 48 does not change, and the upper surface and the lower surface of the passage portion 48 are parallel. In the vacuum cleaner main body 1, the outer peripheral portion 44 to the passage portion A45 are disposed beside the cord reel chamber 42, and the passage portion B46 and the filter 29 are disposed in front of the cord reel chamber 42. As the length to the outlet B46b increases, the overall length of the cleaner body 1 increases accordingly. The exhaust duct 40 has a passage communicating from the inlet A45a to the outlet B46b. The passage portion 48 becoming larger means that the passage communicating with the inside of the passage portion 48 becomes larger. When the vacuum cleaner body 1 is placed horizontally, a view (front view) when the passage portion A45 is viewed from the side of the cleaner body 1 and a view (side view) when viewed from the rear of the cleaner body 1 are as follows. Both are rectangular and the figure (plan view) when viewed from above the vacuum cleaner body 1 is a trapezoid. The front view, side view, and plan view of the passage portion B46 are all rectangular. The outer peripheral portion 44 and the passage portion A45 of the exhaust duct 40 are connected, and the passage portion A45 and the passage portion B46 are connected. Each connecting portion is connected so as to be smooth. This is to prevent turbulence of the exhaust air flow and wasteful catching at each connecting portion. The passage portion A45 is configured such that the other side surface is inclined by about 40 to 50 degrees with respect to one side surface. In addition to the effect of increasing the size to match the size of the filter 29 and the effect of slowing down the flow velocity, it also has the effect of avoiding the cord reel chamber 42 disposed beside the electric blower 28 and increasing the size. . In this embodiment, the plan view of the cord reel chamber 42 is rectangular. The long side of the cord reel chamber 42 and one side surface of the passage portion A45 on the side away from the cord reel chamber 42 are substantially parallel. The side surface of the passage portion A45 closer to the cord reel chamber 42 is inclined so as to approach the cord reel chamber 42 from the inlet A45a to the outlet A45b. The passage portion B46 has a width from the front of the electric blower 28 to the front of the cord reel chamber 42. The reason why the outer peripheral portion 44 and the passage portion B46 are not directly connected but connected with the passage portion A45 that is an inclined portion interposed therebetween is as follows. When the outer peripheral portion 44 and the passage portion B46 are connected without providing an inclined portion, the width suddenly increases from the width of the outer peripheral portion 44 to the width of the passage portion B46. In this case, the exhaust from the exhaust port 28b of the electric blower does not go to the widened portion, and there is a possibility that the effect of increasing the filter 29 may be reduced. In order to avoid this, it is preferable to have a structure in which the width gradually increases, and a structure in which the exhaust gas easily reaches the widened portion of the filter 29. There is a passage portion A45 in order to obtain a structure in which the width gradually increases, and the effect obtained by providing this is as described above. In this embodiment, the size of the outlet A45b is smaller than the size of the outlet B46b, but this is not restrictive. The size of the outlet A45b may be approximately the same as the size of the outlet B46b, and the width may gradually increase from the outer peripheral portion 44 to the filter 29 (from the inlet A45a to the outlet B46b). In this embodiment, the front view, the side view, and the plan view of the passage portion A and the passage portion B are defined as a rectangle or a trapezoid, but this is not restrictive. In addition, as long as it represents a structure in which the passage portion 40 expands, the front view, the side view, and the plan view may be circular or square, and there is no problem in effect.

  In order to reduce the noise of the vacuum cleaner, it is necessary to reduce the sound from the electric blower 28 that is the source of the noise. As described above, in the embodiment of the present invention, the exhaust duct 40 is provided on the exhaust side of the electric blower so that all exhaust passes through the filter 29. Therefore, the collection efficiency is increased and the noise on the exhaust side is reduced. is doing. However, a large amount of sound is generated from the electric blower 28 toward the upstream side from a rotating impeller (not shown) provided on the suction port 28a side of the electric blower.

  FIG. 11 is an external perspective view of the intake duct 27. A front unit 62 is formed immediately before the opening 27 a of the intake duct 27. At the position corresponding to the opening 27a of the intake duct 27 in the front unit 62, a lattice portion 63 having air permeability is arranged. The lattice-like portion 63 is configured by a support frame that extends in the radial direction with reference to the center of the opening 27 a of the intake duct 27 and a support frame that extends in the circumferential direction. The air discharged from the filter 15 of the dust container 5 passes through the lattice portion 63 of the front unit 62 and flows into the intake duct 27.

  FIG. 12 is an exploded view of the intake duct 27. As shown in FIG. 15, the intake duct 27 has a substantially square cylindrical shape with a part of the cross section recessed. The cross-sectional area of the intake duct 27 decreases from one end in the extending direction (front side) to the other end in the extending direction (rear side). One end of the intake duct 27 in the extending direction is open (opening 27 a) and communicates with the dust collector 2. The other end of the intake duct 27 in the extending direction is closed. Therefore, the intake duct 27 has a top surface, a bottom surface, left and right side surfaces, and a back surface. Then, on the other end side in the extending direction of the bottom surface of the intake duct 27, there is a discharge port 27b communicating with the suction port 28a of the electric blower 28. Since the suction port 28a of the electric blower 28 has a circular shape centering on the rotation axis of the electric blower 28, the discharge port 27b of the intake duct 27 also has a circular shape. Therefore, the opening 27a and the outlet 27b of the intake duct 27 are not formed in a straight line, but are formed in a substantially L-shaped relationship. Therefore, the surface of the intake duct 27 that opposes the opening 27a is constituted by the back surface, and the surface of the intake duct 27 that opposes the discharge port 27b is also constituted by the upper surface. The discharge port 27b is not formed on the innermost side of the bottom surface of the intake duct 27, but is formed on the front side of the inner surface. As a result, a space is created between the discharge port 27b and the back surface of the intake duct 27, and the sound transmitted from the discharge port 27b to the opening 27a is reflected by the back surface of the intake duct 27 and transmitted to the opening 27a. The noise transmitted through the intake duct 27 can be reduced. As shown in FIG. 10, the vertically installed electric blower 28 has a cross-sectional shape in the vertical direction that is substantially circular around the rotation axis of the electric blower 28, and an impeller is arranged as shown in FIG. 9. The outer diameter of the upper part (blower part) of the electric blower 28 is larger than the outer diameter of the lower part (electric part) of the electric blower 28 where the electric motor is arranged. And as shown in FIG. 12, the part equivalent to the upper part of the electric blower 28 is dented inside (upper side), and the bottom face of the intake duct 27 has a level | step difference. That is, the cross-sectional area in the extending direction of the intake duct 27 is smaller in the portion corresponding to the upper portion of the electric blower 28 with respect to the opening 27a.

  An inner duct 60 that is a feature of the first embodiment is provided inside the intake duct 27. The inner duct 60 has a shape along the inner wall of the intake duct 27, but not only a portion corresponding to the discharge port 27b of the intake duct 27 but also a portion corresponding to the upper surface of the electric blower 28 (opening 66). . However, a portion corresponding to the upper side surface of the electric blower 28 excluding a portion corresponding to the upper surface of the electric blower 28 among portions corresponding to the upper portion of the electric blower 28 is covered with the inner duct 60. That is, a portion corresponding to the upper surface of the electric blower 28 is formed with the bottom surface of the intake duct 27 but is not covered with the inner duct 60. By not forming the inner duct 60 in the portion corresponding to the upper surface of the electric blower 28, not only does the flow passage cross-sectional area in the intake duct 27 not decrease, but also the vibration transmitted from the electric blower 28 to the intake duct 27 increases. Hard to do. That is, an airtight and vibration isolating member is sandwiched between the discharge port 27 b of the intake duct 27 and the intake port 28 a of the electric blower 28, and the vibration from the electric blower 28 is suppressed from being transmitted to the intake duct 27. ing. If the portion corresponding to the upper surface of the electric blower 28 is also covered with the inner duct 60, the rigidity of the portion of the intake duct 27 corresponding to the upper surface of the electric blower 28 increases, and vibration from the electric blower 28 is transmitted to the intake duct 27. It becomes easy to do. Therefore, in the first embodiment of the present invention, the inner duct 60 is not formed around the discharge port 27b, which is a connecting portion with the electric blower 28 in the intake duct 27, so that the electric blower 28 in the intake duct 27 is connected to the electric blower 28. The rigidity of the connecting portion is suppressed (providing a certain degree of elasticity), and the vibration transmitted from the electric blower 28 to the intake duct 27 is hardly increased. However, the configuration in which the inner duct 60 is not formed in the portion corresponding to the upper surface of the electric blower 28 is not an essential configuration of the first embodiment. Further, it is only necessary that the inner duct 60 is provided on the upper surface of the intake duct 27 facing at least the discharge port 27b of the intake duct 27. The inner duct 60 has a size that is slightly smaller than the inner wall of the intake duct 27 (a few millimeters smaller). Therefore, a space of about several mm is formed between the intake duct 27 and the inner duct 60. The opening edge 67 of the inner duct 60 is formed to extend to the outer peripheral side. As a result, when the inner duct 60 is inserted into the intake duct 27, the opening edge 67 of the inner duct 60 is the opening 27a of the intake duct 27. Abut. This not only suppresses the displacement of the inner duct 60 with respect to the intake duct 27 but also suppresses air from flowing into the space between the intake duct 27 and the inner duct 60. Further, a sound absorbing filter 61 (sound absorbing material) is disposed between the intake duct 27 and the inner duct 60. A sound absorption filter 61 is pasted between the intake duct 27 and the inner duct 60. Examples of the sound absorption filter 61 include sponge, foamed urethane foam, and glass wool. Sponge, urethane foam, glass wool, etc. have cavities in the material. The inner duct 60 is made of resin in the same manner as the intake duct 27. The inner wall surface of the inner duct 60 is preferably free from irregularities. The configuration in which the sound absorption filter 61 is disposed between the intake duct 27 and the inner duct 60 is not an essential configuration of the first embodiment.

  FIG. 13 is a front view of the intake duct unit, and FIG. 14 is a cross-sectional view taken along line AA of FIG. As can be seen from the cross-sectional view of FIG. 14, the intake duct 27 has a double-wall structure of the intake duct 27 and the inner duct 60, and a rotating impeller (FIG. (Not shown) is reduced toward the upstream side. The sound absorbing filter 61 is sandwiched between the top surface, the left and right side surfaces, the back surface, and the bottom surface excluding the portion corresponding to the top surface of the electric blower 28. The sound absorption filter 61 may not be disposed between the intake duct 27 and the inner duct 60, and a simple space may be used, or the inner wall of the intake duct 27 may be a triple wall. Although there is an effect of reducing noise as compared with the case where the inner duct 60 is not provided, the noise reduction effect is improved by arranging the sound absorbing filter 61 between the intake duct 27 and the inner duct 60. Further, by making the flow 64 inside the duct substantially L-shaped, the sound generated from the rotating impeller (not shown) toward the upstream side may pass linearly through the filter 15 of the dust container 5. Therefore, it is possible to suppress the sound from the impeller from being transmitted to the upstream side as compared with the case where the flow 64 inside the duct passes linearly. In the first embodiment of the present invention, since the dust container 5 is exposed so as to form the outer shell of the main body, noise that passes through the dust container 5 and exits to the outside is generated inside the vacuum cleaner main body 1. Larger than the one that houses 5. Therefore, the electric blower 28 is arranged vertically so that the suction port 28a of the electric blower 28 faces upward, and the intake duct 27 is provided from the dust container 5 to the suction port 28a of the electric blower 28, and the electric blower 28 of the intake duct 27 is provided. The surface opposite to the suction port 28a is constituted by double wall surfaces (the inner duct 60 and the intake duct 27), and the noise absorption filter 61 is provided between the double wall surfaces, whereby noise can be reduced. FIG. 15 shows a cross section taken along the line BB in FIG. As shown in FIG. 15, the side surface 65 of the intake duct 27 is also constituted by double wall surfaces, and the noise absorbing filter 61 is provided between the double wall surfaces, so that noise can be further reduced.

  An example of the noise reduction result is shown in FIG. This graph is a frequency characteristic graph showing the noise reduction effect by the intake duct portion 27. Before the improvement (dotted line), the measurement result without the inner duct 60 and the sound absorption filter 61 is obtained, and after the improvement (solid line), the inner duct 60 is obtained. The measurement result in the state which attached the sound absorption filter 61 is represented. In the first embodiment, the rotational speed of the electric blower is about 34000 revolutions / minute, and the high frequency sound peculiar to the vacuum cleaner is caused by the rotating impeller. Since the number of blades of the impeller is 8, according to the graph before improvement, an unpleasant high frequency sound is generated in the vicinity of about 4.5 kHz (blade noise). Further, noise is similarly generated at a frequency (approximately 9 kHz) that is an integral multiple of the blade noise. It can be seen that the overall fluid sound is reduced after the improvement as compared with before the improvement. Although foamed urethane foam is used as the sound absorbing filter 61, it is also effective to use a material having a higher specific gravity in order to further reduce the sound transmitted through the double wall.

  Next, the flow of air during operation (when in use) of the vacuum cleaner will be described. The arrows in FIG. 1 indicate the flow of air. When the user turns on the power of the vacuum cleaner, the electric blower 28 operates and generates a suction force. The air sucked from the hose joint pipe 20 flows into the outer cylinder 6 through the inlet pipe 3, hits the dent portion 8, changes its direction in the radial direction, and further, the outer periphery of the inner cylinder 7 of the dent portion 8. The direction is slightly changed in the circumferential direction at the end, and the direction is further changed in the circumferential direction by the guide tube 38. As a result, air turns around the outer cylinder 6 about the axis of the outer cylinder 6. That is, it becomes a swirl flow. The heavy dust contained in the air collects outside the swirling flow by the centrifugal separation action accompanying the swirling of the air. Light dust contained in the air remains not only outside the swirl but also inside. However, in general household cleaning, most of the dust collects outside the swirling flow, and much dust does not remain inside the swirling flow. The air outside the inner cylinder 7 flows into the dust collecting basket 12 through the outer flow path 35 together with heavy dust. The dust is collected by the dust collecting basket 12, accumulated, and further compressed by the suction force. Since the dust is automatically compressed by the suction force, a lot of dust can be held without bothering the user. The air passes through the bottom surface and the top, bottom, left and right surfaces of the dust collecting basket 12 and reaches the filter 15. On the other hand, the swirling inner air flows into the inner cylinder 7 from the through hole 33 of the inner cylinder 7. Dust larger than the through hole 33 cannot pass through the through hole 33 and remains outside the inner cylinder 7. The air in the inner cylinder 7 together with light dust and small dust flows through the inner flow path 36 and flows into the lower outside of the dust collecting basket 12 in the case 10 and reaches the filter 15. The air that has passed through the dust collecting basket 12 and the air that has not passed through the dust collecting basket 12 merge before the filter 15 and pass through the filter 15. The filter 15 collects light dust, small dust, and other dust contained in the air. Air passing through the filter 15 and containing almost no dust flows through the auxiliary filter, flows into the intake duct 27, passes through the opening at the lower portion of the intake duct 27, and is sucked from the suction port 28 a at the upper portion of the electric blower 28. At this time, the surface of the intake duct 27 that faces the suction port 28a of the electric blower is constituted by a double wall surface, and the noise generated toward the upstream side is reduced by providing the sound absorption filter 61 between the double wall surfaces. ing.

  The air discharged from the discharge port 27 b on the side of the electric blower 28 reaches the filter 29 through the exhaust duct 40 whose width increases toward the filter 29, and is collected by the filter 15 by the filter 29. Dust that was not collected is collected. At this time, noise generated downstream by the exhaust duct 40 and the filter 29 is reduced. The air that has passed through the filter 29 is discharged from the main body exhaust port 30 to the outside of the cleaner body 1 through the electric blower 28, the cord reel chamber 42, the gap at the bottom of the cleaner body 1, and the like. In particular, since the filter 29 has a dust collection efficiency equivalent to or higher than that of a filter mounted on the air cleaner, the air discharged from the cleaner body 1 to the outside is equivalent to or higher than that of the air cleaner. Has been cleaned.

  A substrate 49 is provided below the exhaust duct 40. Since the substrate 49 is a precision component important for the electric operation of the electric vacuum cleaner such as the operation of the electric blower 28, there is a possibility that a problem may occur if dust adheres to the substrate 49. Basically, the cover is provided so as not to cause a defect, but in this embodiment, the purified air after passing through the filter 29 passes through the substrate 49, so that the possibility of causing a problem is further reduced. It has become.

  FIG. 2A shows a perspective view of the dust collector of the embodiment of the present invention, and FIG. 2B shows a cross-sectional view of the dust collector of the embodiment of the present invention. The user can remove the dust collector 2 from the cleaner body 1 by holding the handle 16 and lifting the dust collector 2 upward. However, the dust separator 4 may be left in the cleaner body 1 and only the dust container 5 may be removed from the cleaner body 1. As shown in FIG. 2A, the outer shape of the cross section of the dust separation portion 4 viewed from the axial direction is a substantially circular shape. The outer shape of the cross section of the dust container 5 is substantially circular at the front lid 11, but is substantially square after the front lid 11, and is also substantially square at the filter 15. As shown in FIG. 2B, the opening direction at one axial end of the case 10 and the opening direction at the other axial end of the case 10 are not in a straight line and differ by about 45 ° to 50 °. That is, the axial direction of the dust container 5 is bent slightly forward from the middle. As described above, one end surface in the axial direction of the dust collector 2 (portion of the inlet pipe 3) faces slightly downward (the direction of gravity action), and the other end surface in the axial direction of the dust collector 2 (portion of the filter 15) is also , Slightly facing downward (gravity acting direction), one end surface in the axial direction and the other end surface in the axial direction of the dust collector 2 have an inverted C shape with respect to the vertical surface (gravity acting direction). Therefore, when the dust collector 2 is lifted upward, the amount of catch is reduced, and the user can easily remove the dust collector 2 from the cleaner body 1.

  FIG. 3A shows a perspective view of the inner cylinder and the outer cylinder of the embodiment of the present invention, and FIG. 3B shows a perspective view of the back side of the inner cylinder of the embodiment of the present invention. One end surface of the outer cylinder 6 is closed except for a portion where the inlet pipe 3 is formed, and the other end surface of the outer cylinder 6 is opened. The inner cylinder 7 has an annular extending portion 34 at one end of the cylindrical portion. As shown in FIG. 3A, the outer peripheral end of the other end surface of the outer cylinder 6 abuts on the outer peripheral end of the outer extension part 34 by being inserted into the outer cylinder 6 from the cylindrical portion of the inner cylinder 7 in the axial direction. Thus, the inner cylinder 7 is formed in the outer cylinder 6. As shown in FIG. 3A, the opening direction of the inlet pipe 3 and the opening of the recessed portion 8 are opposed to each other. The opening direction of the recess 8 toward the outer peripheral end of the inner cylinder 7 is substantially downward, and the opening direction of the guide tube 38 in the circumferential direction is counterclockwise. The circumferential opening direction of the guide tube 38 may be clockwise. And the hole penetrated to an axial direction is provided in the upper part of the outward extension part 34, ie, the upper part of the outward extension part 34 is opening. The left wall surface of the opening is higher than the right wall surface. That is, the wall surface (left wall surface) of the upper opening of the extension part 34 facing the opening direction in the circumferential direction of the guide tube 38 is higher than the other wall surface (right wall surface). The surface of the extended portion 34 is spiral, and has a function of a flow path that smoothly guides air to the opening above the extended portion 34. As shown in FIG. 3 (B), the upper substantially semicircular portion in the inner cylinder 7 is provided with a recessed portion 39 that is recessed toward the inner side of the inner cylinder 7, and the lower substantially semicircular portion is formed in the inner cylinder 7. Open in. When the flow rate of air outside the inner cylinder 7 is made larger than the flow rate of air inside the inner cylinder 7 in a state where dust is not accumulated in the dust collecting basket 12, the upper portion of the extended portion 34 is higher than the opening area inside the inner cylinder 7. The opening area may be increased. The area of the recessed portion 39 may be increased as compared with the opening into the inner cylinder 7, or the area of the opening into the inner cylinder 7 may be increased as compared with the recessed portion 39. Then, the user can easily hold the dust separation part 4 or the inner cylinder 7 by putting his / her finger into the recess 39.

  When the cylindrical portion of the inner cylinder 7 is formed of a metal material having an antibacterial effect, first, a plurality of through-holes 33 having a diameter of about 0.1 mm to 0.4 mm are etched into a thin metal plate, and then both ends are formed. Join into a cylindrical shape. The through hole 33 may be punched. Examples of the metal material having an antibacterial effect include stainless steel, silver, and copper. The alloy is not limited to stainless steel, silver and copper, and may be any alloy containing silver or copper or having silver or copper surface-deposited. The thickness of the metal thin plate is 1 mm or less, and about 0.1 mm to 0.5 mm is preferable for improving workability. When the metal thin plate is thin, it is preferable to fix both ends in the axial direction of the cylindrical metal thin plate with a resin having good formability in order to improve the strength and the roundness. Specifically, a substantially circular one-end mold of the inner cylinder 7 having the recessed portion 8 and the guide tube 38 and a mold of the other end of the inner cylinder 7 having the annular outer extension 34 are formed into a molded mold. Then, a cylindrical metal thin plate is set, and then insert molding is performed by pouring resin into a mold. In the case of insert molding, the metal thin plate may not be formed into a cylindrical shape by joining both ends. Thus, only the cylindrical portion of the inner cylinder 7 in which the substantially circular one end portion of the inner cylinder 7 having the recessed portion 8 and the guide tube 38 and the other end portion of the inner cylinder 7 having the annular outer extending portion 34 are made of resin. Can be made of a metal material. Insert molding can simplify the manufacturing process.

  FIG. 4 (A) shows a perspective view of a state where the front cover of the dust container of the embodiment of the present invention is opened, and FIG. 4 (B) shows the rear filter of the dust container of the embodiment of the present invention opened. FIG. As shown in FIG. 4A, when the front lid 11 is pivoted downward with the shaft 31 as a fulcrum, the dust collecting basket 12 is also pivoted downward with the shaft 14 as a fulcrum. At this time, the dust collecting basket 12 is divided into two parts up and down with the shaft 13 as a fulcrum. The opening of the dust collection basket 12 when it jumps out of the dust storage section 5 is wider than the opening of the dust collection basket 12 stored in the dust storage section 5. As a result, the dust stuck to the inner surface of the dust collecting basket 12 can be easily removed. When the user attaches the tissue paper along the inner surface of the dust collecting basket 12, the end of the tissue paper is sandwiched between the frame of the opening of the dust collecting basket 12 and the outer peripheral end of the front lid 11. In this case, the tissue paper can be prevented from shifting or coming off. As shown in FIG. 4B, the filter 15 is also rotated downward and opened with the shaft 32 as a fulcrum. As a result, the user can easily discharge the dust accumulated outside the dust collecting basket 12 in the case 10, and can easily remove the dust attached to the side surface of the case 10 of the filter 15.

  FIG. 5A is a front view of the front cover of the dust container of the embodiment of the present invention as viewed from the outside of the dust container, and FIG. 5B is a front view of the dust container of the embodiment of the present invention. It is the front view seen from the dust accommodating part of a lid | cover. The hatched portion in the figure shows the frontmost surface, not the cross section. A shaft 31 that is rotatably supported by the case 10 is provided at the lower end of the front lid 11. The front lid has a substantially circular shape. A substantially circular portion outside the shaded portion shown in FIG. 5A can contact the outer peripheral end of the other end surface in the axial direction of the dust separation portion 4. A substantially circular portion inside the hatched portion shown in FIG. 5A can contact the outer peripheral end of the other axial end surface of the inner cylinder 7 of the dust separating portion 4. On the upper side of the front lid 11, that is, on the side opposite to the shaft 31, an opening of the outer flow path 35 is formed between a substantially circular portion outside the shaded portion and a substantially circular portion inside. The opening position on the front side (outside of the dust container 5) of the outer channel 35 may be the left and right sides or the lower side of the front lid 11, but the opening position on the back side (inside the dust container 5) of the outer channel 35 is the front cover. 11, the opening position on the front side of the outer flow path 35 is also preferably above the front lid 11 in order to reduce the pressure loss of the air by reducing the length of the outer flow path 35. . On the other hand, an opening of the inner flow path 36 is formed inside the inner cylinder 7. In the front view of FIG. 5A, the opening area of the inner flow path 36 is larger than the opening area of the outer flow path 35, but the upper semicircular portion in the inner cylinder 7 has a recess 39. Therefore, when the flow rate of air outside the inner cylinder 7 is made larger than the flow rate of air inside the inner cylinder 7, the substantial flow path area is that the opening of the inner flow path 36 is larger than the opening area of the outer flow path 35. The area is smaller. A portion where the opening of the outer flow path 35 between the substantially circular portion outside the shaded portion and the inner substantially circular portion is not formed is closed. A substantially circular portion outside the shaded portion shown in FIG. 5B abuts on the outer peripheral end of the axial end surface of the case 10 and a part of the outer peripheral end of the opening of the dust collecting basket 12. As shown in FIG. 5B, the opening of the outer flow path 35 is formed above the vertical center line of the front lid 11. Thereby, when the vacuum cleaner is stopped, it is possible to prevent the dust accumulated in the dust collecting basket 12 from flowing back to the outer flow path 35 and the dust separator 4. However, the opening of the outer flow path 35 may be formed in the center portion including the vertical center line of the front lid 11. Furthermore, it is preferable to form a check valve (not shown) that covers the outer flow path 35. This further prevents the dust accumulated in the dust collecting basket 12 from flowing back to the outer flow path 35 and the dust separator 4 when the vacuum cleaner is stopped. On the other hand, an opening of the inner flow path 36 is formed near the lower end of the front lid 11. However, the opening position of the inner flow path 36 may be lower than the opening position of the outer flow path 35, or may be on the left or right side or the upper side. The hatched portion on the upper side of the opening of the inner flow path 36 contacts the lower end of the outer peripheral end of the opening of the dust collecting basket 12. Then, as shown in FIG. 5B, the opening area of the outer flow path 35 is larger than the opening area of the inner flow path 36 on the back side of the front lid 11 (inside the dust container 5). Furthermore, as shown in FIGS. 5A and 5B, the opening area (FIG. 5B) of the other end (back side) of the outer flow path 35 is equal to that of one end (front side) of the outer flow path 35. It is larger than the opening area (FIG. 5A). That is, the outer flow path 35 extends from one end to the other end. On the other hand, as shown in FIGS. 5 (A) and 5 (B), the opening area (FIG. 5 (B)) of the other end (back side) of the inner flow path 36 is equal to that of one end (front side) of the inner flow path 36. It is smaller than the opening area (FIG. 5A). That is, the inner flow path 36 is narrowed from one end to the other end.

  FIG. 6 is a front view as seen from the dust separation unit side when the front cover of the dust container of the embodiment of the present invention is removed. As in FIG. 5, the hatched portion in the figure indicates the frontmost surface, not the cross section. The substantially circular shaded portion is in contact with the outer peripheral end of the front lid 11. As shown in FIG. 6, the outer peripheral end of the opening on one end surface in the axial direction of the case 10 abuts a part of the outer peripheral end of the opening of the dust collecting basket 12. As shown in FIG. 6, 80% or more of the opening on one end surface in the axial direction of the case 10 is occupied by the opening of the dust collecting basket 12. A region other than the opening of the dust collection basket 12 in the opening of the case 10 (the remaining 20% or less) faces the opening of the inner flow path 36 and communicates with the inner flow path 36.

  FIG. 7 is a schematic view of a vacuum cleaner according to an embodiment of the present invention. In addition to the vacuum cleaner main body 1, the vacuum cleaner includes a suction tool 50 having a suction port, one end communicating with the suction tool 50, a telescopic joint pipe (extension pipe) 51, and one end communicating with the other end of the joint pipe 51. An operation tube 52 having a handle 53 and an operation button / switch that are gripped by the user, and a hose 54 having one end communicating with the other end of the operation tube 52 and the other end forming the hose coupling tube 20 are provided. The hose joint pipe 20 is inserted into the main body inlet 21 of the cleaner body 1 and can be held. Further, wheels 55 are provided on both side surfaces of the cleaner body 1.

  And if the power supply of a vacuum cleaner is turned ON by operation to an operation button / switch from a user, the electric air blower 28 will act | operate and will generate | occur | produce suction | attraction force. The air sucked from the suction port of the suction tool 50 passes through the joint pipe 51, the operation pipe 52, the hose 54, and the hose joint pipe 20 in this order, and flows into the cleaner body 1.

  In this practical example 1, the example in which the electric blower 28 is installed vertically is shown, but if the intake duct 27 is bent, the electric blower 28 can also be applied horizontally.

  According to the first embodiment, in the case where the dust container 5 is an electric vacuum cleaner exposed on the outer surface of the cleaner body 1, noise from the electric blower 28 passes through the dust container 5 and exits to the outside of the cleaner body 1. Although it is easy, since the surface (upper surface) facing the suction port 28a of the electric blower 28 of the intake duct 27 is constituted by a double wall surface and the sound absorption filter 71 is provided between the double wall surfaces, noise can be reduced. Further, the intake duct 27 is configured to be substantially L-shaped, and the noise other than the surface having the suction port 28a of the electric blower 28 is a double wall with the sound absorption filter 27 interposed therebetween, whereby noise can be further reduced. In addition, since the wall surface is only doubled, there is little reduction in suction force compared to a single wall surface.

  17 to 22 show another embodiment of the present invention. Inside the intake duct 27, a silencer cylinder 70 having a wall surface 73 on a surface facing the dust container 5 is provided. The muffler cylinder 70 has innumerable apertures 72 on the outer wall of the flow path, and the outer periphery of the apertures 72 is closed with a sound absorbing filter 71. The silencer cylinder 70 is connected to an upper portion of a substantially rectangular front wall portion with a cylindrical opening 72 having an oval cross section. The lower part of the substantially rectangular front wall portion of the silencer cylinder 70 forms a wall surface 73. The length of the opening 72 in the extending direction is shorter than the length from the opening 27a of the intake duct 27 to the outlet 27b. The outer shape of the opening 72 is smaller than the outer shape of the inner duct 60 of the first embodiment. Therefore, the space between the intake duct 27 and the opening 72 is wider than the space between the intake duct 27 and the inner duct 60.

  FIG. 19 shows a front view of the intake duct unit, and FIG. 20 shows a cross section taken along the line CC in FIG. FIG. 20 is a cross-sectional view of the intake duct unit taken along the line C-C. Air discharged from the filter 15 of the dust container 5 passes through the lattice portion 63 of the front unit 62 and flows into the intake duct 27. At this time, the entire air flow flows inside the silencer cylinder 70, and the noise is reduced by the sound absorbing filter 71 provided on the opening 72 and the outer periphery.

  FIG. 21 shows a cross section taken along the line DD in FIG. As shown in FIG. 21, noise can be further reduced by providing a sound absorbing filter 71 on the entire circumference of the silencer cylinder 70. In the present embodiment, the rotational speed of the electric blower 28 is about 34000 revolutions / minute, and the high frequency sound peculiar to the vacuum cleaner is caused by the rotating impeller. Since the number of blades of the impeller is 8, an unpleasant high frequency sound is generated in the vicinity of about 4.5 kHz (blade noise). Furthermore, noise is similarly generated at a frequency that is an integral multiple of the blade noise.

  FIG. 22 is a frequency characteristic graph showing the noise reduction effect by the intake duct portion 27. Before the improvement, the measurement results in the absence of the silencer cylinder 70 and the sound absorption filter 71, and after the improvement, the silencer cylinder 70 and the sound absorption filter 71 are attached. The measurement results in the state are shown and compared, it can be seen that the blade noise is reduced. First, it can be seen that the blade noise primary sound near 4.5 kHz is reduced, and the blade noise secondary sound around 9 kHz is also reduced. The size of the aperture 72 is φ2 to 3, and the aperture ratio of the portion facing the flow path is preferably 50% or more. The material of the sound absorbing filter 71 is a high frequency when a material having a high high frequency sound attenuation effect is used. This is effective for reducing sound.

  Further, if the inner diameter cross-sectional area 74 of the silencer cylinder 70 is reduced, it is effective for noise reduction, but at the same time, the pressure loss, which is the basic performance of the cleaner, is increased. The pressure loss of the entire cleaner depends on the thickness of the hose 54 and the joint pipe 51 connected to the cleaner body 1. In particular, pressure loss occurs due to the thickness (minimum inner diameter) of the joint pipe 51 to reduce the suction force. Therefore, by increasing the inner diameter sectional area 74 of the silencer cylinder 70 from the minimum inner diameter sectional area (not shown) of the joint pipe 51, it is possible to reduce the pressure loss in the silencer cylinder 70 and to prevent a reduction in suction force. Can do.

  The second embodiment can be applied not only to the case where the dust container 5 is arranged obliquely, but also to the case where the dust container 5 is arranged vertically (the cyclone axis of the dust container 5 is vertical).

  According to the second embodiment, the silencer cylinder 70 having a wall surface on the surface facing the dust container 5 is provided inside the intake duct 27, and the silencer cylinder 70 has innumerable apertures 72 on the outer wall of the flow path. In addition, the outer periphery of the opening 72 is closed with the sound absorbing filter 71 and the inner diameter cross-sectional area of the silencer cylinder 70 is made larger than the minimum inner diameter cross-sectional area of the joint pipe 51, so that particularly high-frequency sound ( About 4 kHz to 10 kHz).

  The present invention is applicable to a vacuum cleaner.

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Dust collector 3 Inlet pipe 4 Dust separation part 5 Dust accommodating part 6 Outer cylinder 7 Inner cylinder 8,39 Recessed part 9,19,22,25 Packing 10 Case 11 Front cover 12 Dust collection basket 13,14 , 31, 32 Shaft 15, 29 Filter 16, 53 Handle 17 Button 18 Transmission rod 20 Hose joint pipe 21 Main body inlet 23 Caster support 24 Dust removal device 26 Auxiliary filter 27 Intake duct 27a, 66 Opening 27b Discharge port 28 Electric blower 28a Suction port 28b Exhaust port 30 Main body exhaust port 33 Through hole 34 Outer extension 35 Outer flow path 36 Inner flow path 38 Guide pipe 40 Exhaust duct 41 Code reel 42 Code reel chamber 43 Plug 44 Outer peripheral part 44a Outer peripheral part upper surface opening 44b Outer peripheral part Side opening 45 passage part A
45a Entrance A
45b Exit A
46 Passage part B
46a Entrance B
46b Exit B
47 Code 48 Passage portion 49 Substrate 50 Suction tool 51 Joint pipe 52 Operation pipe 54 Hose 55 Wheel 60 Inner duct 61, 71 Sound absorbing filter 62 Front unit 63 Grid-shaped part 64 Flow inside the duct 65 Side wall 67 Open edge 70 Silencer cylinder 72 Open Hole 73 Wall surface 74 Inner diameter cross section

Claims (6)

In a vacuum cleaner comprising a dust collector, an electric blower that generates a suction force, and an intake duct that communicates the dust collector and the electric blower,
The intake duct includes a dust collector side opening communicating with the dust collector and an electric blower side opening communicating with the electric blower, and a surface facing the electric blower side opening is an inner wall surface of the intake duct. Configured,
The vacuum cleaner characterized in that an inner wall surface of the intake duct facing the electric blower side opening is composed of multiple wall surfaces. The vacuum cleaner according to claim 1, wherein
The vacuum cleaner characterized by the surface different from the surface in which the said electric blower side opening was formed among the inner wall surfaces of the said intake duct being comprised with the multiple wall surface. The vacuum cleaner according to claim 2,
A vacuum cleaner characterized in that a portion of the inner wall surface of the intake duct in which the electric blower side opening is formed, excluding the periphery of the electric blower side opening, is also constituted by multiple wall surfaces. In the vacuum cleaner in any one of Claim 1 to 3,
A vacuum cleaner characterized in that at least one of a sound absorbing material, a sponge, a foamed urethane foam, and glass wool is disposed between the multiple wall surfaces. In a vacuum cleaner including a vacuum cleaner body including a dust collector arranged in an oblique direction or a vertical direction, an electric blower that generates suction force, and an intake duct that communicates the dust collector and the electric blower.
The dust collector is exposed to form an outer shell of the cleaner body;
A silencer cylinder having a cylindrical opening portion having a plurality of holes on the circumferential surface inside the intake duct,
The vacuum cleaner characterized by the wall surface formed in the front surface of the said silencer cylinder facing the said dust collector. The vacuum cleaner according to claim 5,
A hose connected to the cleaner body, a joint pipe connected to the hose, and a suction tool connected to the joint pipe,
A sound absorbing filter is provided on the outer periphery of the opening,
An electric vacuum cleaner characterized in that an inner diameter cross-sectional area of the cylindrical opening is larger than a minimum inner diameter cross-sectional area of the joint pipe.

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